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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Class5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        HttpCodeLib.XJHTTP http = new HttpCodeLib.XJHTTP();
        private void Form1_Load(object sender, EventArgs e)
        {
            //;loginhash=Le8fx">
            //name="formhash" value="fba244a2" />
        }

        private void btn_Login_Click(object sender, EventArgs e)
        {
           string str= http.GetHtmlString("http://www.xuanjics.com/member.php?mod=logging&action=login&infloat=yes&handlekey=login&inajax=1&ajaxtarget=fwin_content_login");
           string loginhash = GetStringMid(str, ";loginhash=", "\">");
           //  \"=" 
           string formhash = GetStringMid(str, "name=\"formhash\" value=\"", "\" />");

           string url = string.Format("http://www.xuanjics.com/member.php?mod=logging&action=login&loginsubmit=yes&handlekey=login&loginhash={0}&inajax=1", loginhash);
           string data = string.Format("formhash={0}&referer=http%3A%2F%2Fwww.xuanjics.com%2F&loginfield=username&username={1}&password={2}&questionid=0&answer=", formhash,
               txtUseName.Text, txtPwd.Text);

           string ret = http.GetHtmlString(url, "post", data);
           MessageBox.Show(ret.Contains("欢迎您回来")?"登录成功":"登录失败");
        }

        /// <summary>
        /// 取文本中间
        /// </summary>
        /// <returns></returns>
        private string GetStringMid(string allStr,string firstStr,string lastStr)
        {
            int index1 = allStr.IndexOf(firstStr);
            int index2 = allStr.IndexOf(lastStr, index1   1);
            
            if (index1 < 0 || index2 < 0)
            {
                return "";
            }

            index1 = index1   firstStr.Length;
            index2 = index2 - index1;

            if (index1 < 0 || index2 < 0)
            {
                return "";
            }

            return allStr.Substring(index1, index2);
        }
    }
}